Merge pull request #7277 from alivedise/bugzilla/825798/automatic-shu…

…tdown-low-battery

Bug 825798 - Automatically shutdown when battery is too low

apps/system/index.html

@@ -55,10 +55,6 @@
     <script defer src="js/system_dialog.js"></script>
     <script defer src="js/icc_cache.js"></script>
 
-    <!-- Battery Manager -->
-    <link rel="stylesheet" type="text/css" href="style/battery_manager/battery_manager.css">
-    <script defer src="js/battery_manager.js"></script>
-
     <!-- Grid View -->
     <link rel="stylesheet" type="text/css" href="style/gridview/gridview.css">
     <script defer src="js/gridview.js"></script>
@@ -75,6 +71,10 @@
     <link rel="stylesheet" type="text/css" href="style/sleep_menu/sleep_menu.css">
     <script defer src="js/sleep_menu.js"></script>
 
+    <!-- Battery Manager -->
+    <link rel="stylesheet" type="text/css" href="style/battery_manager/battery_manager.css">
+    <script defer src="js/battery_manager.js"></script>
+
     <!-- Keyboard -->
     <script defer src="js/keyboard_manager.js"></script>
 

apps/system/js/battery_manager.js

@@ -8,6 +8,8 @@ var BatteryManager = {
   TRANSITION_SPEED: 1.8,
   TRANSITION_FRACTION: 0.30,
 
+  AUTO_SHUTDOWN_LEVEL: 0.02,
+
   _notification: null,
   _screenOn: true,
   _previousLevel: 0,
@@ -18,10 +20,23 @@ var BatteryManager = {
     this.notification = document.getElementById('battery');
   },
 
+  checkBatteryDrainage: function bm_checkBatteryDrainage() {
+    var battery = window.navigator.battery;
+    if (!battery)
+      return;
+
+    if (battery.level <= this.AUTO_SHUTDOWN_LEVEL)
+      SleepMenu.startPowerOff(false);
+  },
+
   init: function bm_init() {
     this.getAllElements();
     var battery = window.navigator.battery;
     if (battery) {
+      // When the device is booted, check if the battery is drained.
+      // If so, SleepMenu.startPowerOff() would be called.
+      this.checkBatteryDrainage();
+
       battery.addEventListener('levelchange', this);
       battery.addEventListener('chargingchange', this);
     }
@@ -43,7 +58,10 @@ var BatteryManager = {
         if (!battery)
           return;
 
+        this.checkBatteryDrainage();
+
         var level = Math.min(100, Math.round(battery.level * 100));
+
         if (this._screenOn) {
           this.notification.dataset.level = level;
 

apps/system/js/sleep_menu.js

@@ -219,6 +219,10 @@ var SleepMenu = {
     if (!power)
       return;
 
+    // Early return if we are already shutting down.
+    if (document.getElementById('poweroff-splash'))
+      return;
+
     // Show shutdown animation before actually performing shutdown.
     //  * step1: fade-in poweroff-splash.
     //  * step2: The 3-rings animation is performed on the screen.